William Ewart Gladstone
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Challenger expedition
Space Shuttle Challenger
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Royal Navy
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Portsmouth
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Mariana Trench
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Indian Ocean
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Henry Moseley
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Fridtjof Nansen
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List of Scots
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December 21
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Challenger Deep
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Continental drift
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Christmas Island
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Alexander Agassiz
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Atlantic Ocean
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Carl Wilhelm Siemens
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Sea of Japan
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Oceanography
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1872
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Challenger Expedition
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